FYI: When you update the MX-20 firmware it saves all your "Model" info, you don't lose it. I also put in a new Rx, and did a "bind", my Radians worked, but not the MK. Error 7 = no signal So even though the firmware did not reset the Models it DID reset the SUMO and the 12, which is found under the Telemetry menu, "setting and data view", "Channel out type", and this has to be changed from "Once" to "SUMO" and after that "12". I spent the better part of an afternoon figuring this out. It had been so long I entirely forgot this step. http://www.mikrokopter.de/ucwiki/en/MX-20